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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbd5b92406f38a83aae438f504b3055ec0e4b0584d7df13139832f3cdd5996e' 
  AND token = 'jXx9xN7eQxc6P50dnwFmRsrpfPH5o1g5hmoPXeqtZQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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