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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e67ebddc85eb77a93214aa58c14bd3962a8c6ef1449d3f05bf1bb92a228e98' 
  AND token = '3Mzb80bsss6UDs71skw71sx1NRBfQNQGRqcpU/s6wkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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