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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df111ccb44778fa4c1d20513cfce90a8c76e8f14ea2c27143f2ac2efb1655f5e' 
  AND token = 'oiaB5mIdSAjviloywt0X2zUEUW4b/AaVWaTkPFB7z2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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