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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ae709e60f7590976ea1592fcf2f85ab62cdf3ae4247967d269be40b9e7be73' 
  AND token = 'iXRrqXGpjM3PUGgkY5oegaN5hhfvvnWHk5nTI7gl8AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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