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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa22d8ce3d7bb1b65aba0ee89cae3f7eee753c30c00dbd3b243be088619c19d' 
  AND token = 'nXBhbKhboDrUqfQNwLFHb602MrIkBhVG2jeisUodbIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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