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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d672d6ed957b13fe92ed34464da94683570a9a33709ceaa4534817fb221696c' 
  AND token = 'LbEPV5v5g6A6qlJk/EauUR7kZbqW6Pvs+oa7Ctw9N00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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