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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f651237a243a510b437deeebde8568238aaa2e3e7f21e0cc7bc8fcb3fb4039' 
  AND token = 'eH4yiz/qHJPheQg2JNyBcyY9/DeCY0zCP35B1Ns959M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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