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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36670cf348f843330dc2825add3bc2292e622820408e296beb9747d8d35c3ca8' 
  AND token = 'kj5e/I/4Bh06Fon7U321f0fqK9798tSogX0cn47X4kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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