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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c203649a3f0039fb9c2fc1c9aba81b2bb7d2b19ccfcbabb5952a86e7f08329' 
  AND token = 'U59g8qB43B060VgO5N3Rdgk6jhDKoPnd2GJzG9d48EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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