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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb34c3dfea930f6866c9768af331a9e657239b7a085852c2789a73656d61c24b' 
  AND token = 'xQ1NX+c0DKSUCnJo5NRyznSPmzkaxKwct8PGeMZAh4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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