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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302ab12f0ecdf1042a6c8c5146968054788149f89515ba49afc0433052f7872d' 
  AND token = 'taXe3owfzxO+PM7U5CsfRwG+D8ON4PfI0DNMXxNhMQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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