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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b75a2edc0b4b1ef572945f17f50cb1986d63e19cb69feffee5494bde0448d87' 
  AND token = 'YBYxcZS7oKSCEmM5L2GsYA8FGg90OKVVAd7n1cHJuso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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