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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcbd7ba5f918d7112b9d9fc26c2103f5748ad08abc3e987e63621c69f2df244' 
  AND token = 'bgx9dyW38JX5qhB4Ycmvsy8Ay0sczTQvBtolOBAUbJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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