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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e3599d24a12a4990231a68aa9e6d613cce5ca7256345745453e85841e51e0e' 
  AND token = 'UHT488xoyJ9uMk48DNRKrRMMnRIa9It3cP2DghbR2os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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