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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013f2f19d2dc0e1940b7b93df98cf5902e3fb21eaceb6ff639ccd125335f0618' 
  AND token = 'jajHnxM0Ou8tS3gphCT5prj1lpQnCLW+qTEjA8P0rdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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