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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc95c98b7f2e069d126537103deaed84ae947b4d7c9363cac2ad2acb53faa7a' 
  AND token = '2zPbC7vFDFDnpCtMgVLaUj9t2mzvwlTE4X0P/P6EiWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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