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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5b5839cc114963ad374811c708e827abdbae21cfcdba0e45afe2c3f310be0d' 
  AND token = 'DDO99xrKynAYov7QLu54y3T3F/EtpWlkwYCZk+Zlm3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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