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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44e35b492073ef05e72842121e5cd9766749f4fd282a38ac7e459fbc6d019f6' 
  AND token = 'y9y3VmddGek06AoxsO3JccTRuBnP7O+x0fGPh5urYDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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