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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af82cafde0e37e4275e4579ad68e1119b525d7e35b9b764fdbfde10191f1a01c' 
  AND token = '7oAMbv3unC5KfKHCOgGcyC14b1Hy6w3o2vF21gnLFhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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