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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5655156e2e90d96ac3214b9d53666c5c950becdf8a75707f85f3613408a37b' 
  AND token = 'WNKwxvj/aK/cVcBvcBKA6jHVXnaybfqWq18LKLtTE7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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