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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c5ffd95157da64692f1e6133b13cbe37d171588e6bc0149d9297e9563c4478' 
  AND token = 'dk0kOo6tDJH4P060xz5LSwCEwRNlptmK+1qu65bzoUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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