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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edaca725ddff0994c44fe634abff8243f096156821bf5e537636ef9f60b975dd' 
  AND token = 'fdUqjsUrbv0MpST9mzV8G3o7IotcdgN7GIp8eayM18Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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