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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b1d43e9b072311861a1bdcac4d5af0b649309bffebda058eaaf7b18c2e7632' 
  AND token = 'S47Xr/v1/8EQFp0Ev2xPCfAdGJHV3fk/mfxgxAbjeAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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