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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ce1ba7ddbbd47c2ed247be65ca343820f9ca3c150a68e941cfe71a20d314cd' 
  AND token = 'qkoDhQ2YoyH8F1qR1FtPUe9/X0E3KigxZUeJIlmkTpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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