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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb38bcb00a5518d2f877fe4df94ea608b7d92c82da5ed9993dfacb96ffb58f8' 
  AND token = 'J5U5Zsm5cnMUdtqEEIZzS8SJ+dZjaoiQOonehuB7tBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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