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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc5432325600a62ff404897ce4bc47a98182b557e7efc808005953d1c3e59ec' 
  AND token = 'PGyxqDJP4kFmD03hwNCZW8Tz1ZoVngQWEOQy+tql5xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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