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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9bdb071b02a5a7eda68d4e6ad8121660abccd9c1ec74802a998e222de9a39e' 
  AND token = '8JPZgr/fzzJTphWjPnCiSY8QJlP52Wi5CGGMeg21feM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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