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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72fd4d142d9bbdb9893149f4d5e14fb665952304e4fcd33871f8da7b7a4dfa5' 
  AND token = 'AdwUzsmFr2pEYRXdXzMSQpeflJuIQzqqlPZuum/Ln00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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