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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a0a175254e44660cfd3da5f64c933240c6adb686d9efb28f2039a9796928bc' 
  AND token = 'Vzn63ttsU8tgRwXKHaDMeuLxr5Dt6ZgX50nRLmvAOf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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