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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732091863b1846c4a1106641446a798cdad70d33d343afc724c4b002d96c88f4' 
  AND token = 'b9sfef26oFE0dkc9xDpTK11v3m9NDyctm7HdILxdWgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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