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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7f6003a35a0b5c3829f456ad8b893aa6a6e30f2ffcf5d33cbc6802632c5195' 
  AND token = '0HW/9zddaPxrvugF39ABsko4EBgd4pfSmsgH0PmfPaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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