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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef969e5d84282e5baf94676e1ddfdf283d87e5d4d76f2c2ebe8d2e2cfc66d0f6' 
  AND token = '5Ki0YcmcMRtiWY+OzVbCiou5x9rnMqNu6GYQehubu9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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