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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a1b87dee80113fc8761d7b62fcde8abaa6b406be35f6a3b1da6bf812630e29' 
  AND token = '6HtYgSjAifY0HC5FxiUS/2QqhPfIZv0sq7fk3volq7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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