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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f1994d2cd78004f0e2d85940c6e419f7e7264cb3af74ad47952e31051fb786' 
  AND token = 'OB0mEvKU2jWW42GAUaZ34zwWnNc3bzQjTZvvb54pC5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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