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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5ed5fe901ecb5e1dad81477699b4f7e2d9908e44d04de3ee27a35cf6a71df7' 
  AND token = 'B9lxSG0xDNcpVgfHX/L4ue5yjChq/xZEAtDgHhNXcvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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