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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6f6395b74908826d873baa34350a50162f4a0b4d106e03d71abba6be92f80b' 
  AND token = 'cQw8nBrEBc4YlMpKthNHPI/qN1Rv3M3dJS8wcRjiwvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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