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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d1ecacc50615731830ef272738a8ab16791724fcf06e687d41b6b83d705a7d' 
  AND token = 'MjlUmFFSuK6xN5k9gQquLCxbqZxf0PUIwhFTrdYWIbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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