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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b91493736d4d6e15f992245733d691fcff08e9772a0c9b246a6c2a7fdd04da' 
  AND token = 'ratzH7IehEjMGRIIhtbFTAS2K2QrBhmBn6bJvED1EiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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