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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf583e9b5377ae3ef2dd4c1062e75695b548c3949fdde1212a9f51c786ca86e6' 
  AND token = '3qezz9oT+fv1+UI+MPxG4RkfF7aey0NoLRLb3hAJcjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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