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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4947c38450f0e9eeb490e7a7b0019064e2c8d03f3b420566ca7af8a352b71ee0' 
  AND token = 't497tFJVywPSrzYYjuvAYCQW/rPyvpSnixoURxnJ2+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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