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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634c6b491f886644428c85d7eb6ddee2484a4e42481f83b2b3da6e66b0518d31' 
  AND token = '3sNMSfIU13RdRybYRYkueayBtlLiGA8RgvHZ8FOHLHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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