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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f8203992800aea45793acaf082eee1bb1ed9f0e0bea341f697c03f1cfd567e' 
  AND token = 'h2YytYgDrUFD2IpzkaJbfva1dGQ24K5Z+Y/Va/eS69s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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