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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a78e9d335362e66c4c6746c9abfcd491acf35f3223ed2998caa21fea664e5a' 
  AND token = 'Av5cCnt3SVp8ii/Zvrot+w8ZGp36P6VUWaIgrvQdBVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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