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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae01d532d1e6165c61c76c5bc0e15ab46a539840b31925f2a61bda56c1f94ca' 
  AND token = '/d0sivri5cz5medlCAnSC7IaKzpS3DvVG4bPgfVKi6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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