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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc513c54b9a974e9320ff5ae4cc18574e806d88b68140415646a3c220bfeda6e' 
  AND token = '9o2pWY7DdHVKoZRA7aDsCxKIBE1OArCeuInO7p0aVWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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