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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a8d773a112657a0de542c37b4d494b1d3344d659740e46f79795c2d7db1445' 
  AND token = 'HkLhyekFnKKsYNTimjY11FbYxWm98HGDI8Bm0af1JTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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