SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5dc886669d3f8f6ee7f00567422f51fd74b312d357bc7113ad9d4b84509d4e' 
  AND token = 'BzluKTXNDXJCfEgJ/UqbER91FqB1n2OaPqNfqgfnV8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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