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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6921b1eb941c96db0f2971cf7ae426fd589003cfae334f5f3fc6d8a026617516' 
  AND token = 'KamhaoDTXN770cYG/2WFrUehcLR+Ie8gbERhI0bLsU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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