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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c928c9fd14a7d2943acb3355f31a29ff8380b471b58872d2af870e2d764a8dc7' 
  AND token = 'YnFeFwBfMxGv2kFjnNhoXUFHYsMpBEBSudzhHw789D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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