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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801a7b8a0acaf4ab3529c72fbacbbce590e46ff5287f5476497d13b5d0c34439' 
  AND token = '/XnTXt1xj2s72kuxWK9CmAKafLiw6QGeUY9Iy5lIbus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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