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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1c992291d4de2efd7c427c05de1270bf3db14127266fb400b94be2ab17fd81' 
  AND token = 'lefrn7J/3Y8vr8hRhxBULGTE55W3/KfC2NR1ZI6+8LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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