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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b611d3240864b98fa2985f9c79d717aa7244c7c3b0c593d9291ff60fc4249bcf' 
  AND token = 'RQER3cKdKYvdW++lNbvSfUdJMim2R0tpEdCj6aNUYbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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