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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65cd79bbba603a878a3ae7f623d9b437dd4dd700bceec65be2621363b7b5c3d' 
  AND token = 'DiEtGkBUwkj44D3FK5AVnqvj2otEcEXTNTD16RSdccU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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