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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2588ee821019b72e7255613ceaca4ed8ca3965876660000620b8802c5800609d' 
  AND token = 'sQ2C0Y0W9SR0mC7jiLRJUM1jZYXI/zYJJ6rRupSh6oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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