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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f696cf26fe180c2504735fa4955f9787a9ba44d3a53320e26811e071710825a7' 
  AND token = 'BU8tqujqVwt4DW/UW1KznBw7Ngx9uMfUWwwabUdWco0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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