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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e44fe841d1be3c020a75c80831cd360408a3d62ff6be9e2d06b6cb0ba00548' 
  AND token = 'JB2leKzLtFSwZWC0FdyuTLCp5E+Q7M5MRRo0HhBWxLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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