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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35df6baa9a1e593fe7d162441640b526f6e507f846a0cf7827468c6663e250ab' 
  AND token = 'H3D34QLgzuoS9/J40txfAQnCH37K60l6ECoUtQYQwAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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