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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9420cfbd2e19d3a659146a6741f25960fd63dc839b7b052c9f98e938e7b66ad2' 
  AND token = 'kux65N/lrkJzAvmIL9IOw6JYOa+HN280SJQKGFf60DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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