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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25af3c35b24d87dbe2832296dd82fa3f9a8f2a0b9c6e7eddf39e3b09427a31d0' 
  AND token = 'mODymA5jxjMCEI9x7AEC/kclJ/9VbLPzjQx5U5sEsuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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