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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25fe342bd3dc721e15ba961e53519e9f702bd1a409453f9d6f1d5101af183a0' 
  AND token = 'p8m398R7ku+AWBjR2Hck+1DxaTo3TnKFb++XSKd90Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}