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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e3285041d8efd3c73080ea0a55c76a3f60f957307a351fbe8eae2c2968874d' 
  AND token = '9ZuCMR5txvkj1cXZ0pOiM1FabEuueiOdnAgC/n4o4N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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